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w in (-oo:+oo)
12-((7*w)/6) = 1-(2*w) // - 1-(2*w)
2*w-((7*w)/6)-1+12 = 0
(-7/6)*w+2*w-1+12 = 0
5/6*w+11 = 0 // - 11
5/6*w = -11 // : 5/6
w = -11/5/6
w = -66/5
w = -66/5
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